Low CO<sub>2</sub>, Ultralow NO<sub>x</sub> Heavy Duty Diesel Engine: Experimental Results

Salvi, Ashwin; Redon, Fabien; Youngren, David; Fromm, Laurence

doi:10.4271/2022-01-0426

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…Experiments were conducted on a 3-cylinder Achates Power 4.9 L combustion development engine 9,10 at Clemson University. This engine was designed for fundamental development and design flexibility and does not have production level representative friction.…”

Section: Experimental Setup and Methodologymentioning

confidence: 99%

Experimental study of the impact of scavenging efficiency on diesel combustion in an opposed-piston two-stroke engine

Gainey

Bhatt

O'Donnell

et al. 2022

International Journal of Engine Research

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The opposed-piston two-stroke (OP2S) engine is a promising alternative powertrain technology that can offer thermal and brake efficiency improvements over conventional four-stroke engines. In recent years, many of the technical barriers of the OP2S engine architecture have been overcome. However, there is still a need for fundamental studies to provide insight into the scavenging and combustion processes of the OP2S engine to help design and operate the most efficient combustion systems using this engine architecture. This work aims to provide such insights by analyzing experimental data collected on a 3-cylinder, 4.9 L OP2S engine. Specifically, a scavenging efficiency sweep, an engine speed sweep with a constant scavenging efficiency, and an engine speed with a constant pressure differential across the engine were studied in detail. It was found that in diesel combustion, as the scavenging efficiency decreased, the increase in temperature of the hot, internal residuals resulted in a significant increase in heat transfer. Despite lowering pumping losses, this resulted in an overall decrease in brake efficiency. When the bulk thermodynamic conditions of two different scavenging efficiency cases (67% and 72%) were matched at port closing, the lower scavenging efficiency case still displayed a 0.7 percentage point penalty in net thermal efficiency and an increase in engine-out indicated specific emissions of NOx of 18% due to residual stratification in the cylinder. The results presented in this work show that the optimal breathing strategy in diesel combustion on an OP2S engine architecture is one that results in a slightly under-scavenged environment at port closing. However, the results did show potential system-level efficiency benefits of decreasing scavenging efficiency, meaning that alternative fuels and combustion strategies without the constraints of diesel combustion could achieve system-level efficiency gains by running significantly under-scavenged.

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Section: Experimental Setup and Methodologymentioning

confidence: 99%

Experimental study of the impact of scavenging efficiency on diesel combustion in an opposed-piston two-stroke engine

Gainey

Bhatt

O'Donnell

et al. 2022

International Journal of Engine Research

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View full text Add to dashboard Cite

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Effects of multitype intake structures on combustion performance of different opposed-piston engines

Wang,

Liang,

Zuo

et al. 2023

Applied Thermal Engineering

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Effect of swirl-spray impact on the comprehensive performance of uniflow-scavenging opposed-piston engines

Wang,

Liang,

Zuo

et al. 2024

Applied Thermal Engineering

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Low CO₂, Ultralow NO_x Heavy Duty Diesel Engine: Experimental Results

Cited by 4 publications

References 9 publications

Experimental study of the impact of scavenging efficiency on diesel combustion in an opposed-piston two-stroke engine

Experimental study of the impact of scavenging efficiency on diesel combustion in an opposed-piston two-stroke engine

Effects of multitype intake structures on combustion performance of different opposed-piston engines

Effect of swirl-spray impact on the comprehensive performance of uniflow-scavenging opposed-piston engines

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Low CO2, Ultralow NOx Heavy Duty Diesel Engine: Experimental Results

Cited by 4 publications

References 9 publications

Experimental study of the impact of scavenging efficiency on diesel combustion in an opposed-piston two-stroke engine

Experimental study of the impact of scavenging efficiency on diesel combustion in an opposed-piston two-stroke engine

Effects of multitype intake structures on combustion performance of different opposed-piston engines

Effect of swirl-spray impact on the comprehensive performance of uniflow-scavenging opposed-piston engines

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Product

Resources

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Low CO₂, Ultralow NO_x Heavy Duty Diesel Engine: Experimental Results